- -
Junk Motor
(
http://www.clubcobra.com/forums/backdraft-racing/75875-junk-motor.html)
| jeffko |
01-12-2007 09:29 AM |
Junk Motor
Have any of you guys ever heard of a fuel injection leaning out off idle and trashing a motor to where 6 of 8 cylinders were 30% of the 2 decent cylinders on a compression test? By the way, the engine has less than 10 miles on it. :JEKYLHYDE
|
| RMHINC |
01-12-2007 10:51 AM |
calling madmax
|
| cbreez |
01-12-2007 12:36 PM |
That's not a likely scenario in that little time...are they next to one another? Make sure the leakage is from the rings, not the valves. With a lean condition, you still should have lubrication on the cylinder walls. Did you have a good leakdown test first, then it went bad?
good luck...
|
| craigayl |
01-12-2007 04:27 PM |
Tell us more.. Did you shoot oil in the cylinders to verify that it is a ring problem? With only 10 miles I'd be more suspect of a valve problem or an assembly problem that was there from day one
|
| jeffko |
01-13-2007 07:29 AM |
The engine actually belongs to a new cobra guy I am trying to help out and he has taken it back to the engine builder. That is where the finger pointing by the builders and suppliers started.
What do you guys think about the timing somehow jumped to allow it to be way advanced and cause detonation? I have heard that detonation is far more destuctive than a lean condition. I guess I am having trouble with thinking the injection could be the cause for that much damage so quick.
Calling Dr Clayton..........where are you?
|
| Excaliber |
01-13-2007 09:01 AM |
I hate it when a poster starts THREE threads on the same subject. THAT my friend is 'spam'.
|
| jeffko |
01-14-2007 10:42 PM |
excaliber, put your sword away...sheez. I was just looking for a few different opinions from the fuel injection and small block guys also.
|
| jeffko |
01-26-2007 10:28 AM |
Update
Heads were removed. Pistons/cylinders show no signs of being burnt or excessivley worn. Engine is going on a stand next Monday and pistons will be pulled to check the rings. That leaves valves out of time with the pistons. Since it was dynoed at 650hp you gotta think the cam somehow slipped way out of time. It never did idle very well, but we attributed that to the injection needing fine tuning.
I am getting this 3rd hand so I have questions also.
|
| cbreez |
01-26-2007 01:49 PM |
going back to what you said about having two good cylinders, makes me think the cam timing is ok....I'd pull every valve out, and make sure they are not bent...pour some isopropyl alcohol in the ports before doing that, to leak check them all...good luck to whomever!
|
| jeffko |
01-26-2007 06:03 PM |
Good point cbreez, I forgot about that.
|
| All times are GMT -7. The time now is 03:46 AM. |
|
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link:
